This part's a PITA. Take some wire, feed it through the mount hole and fish it down into the oval opening on the bottom of the frame. Attach the bolt to the wire and pull it up and through. It's a delicate process. I did not take off the bumper.
Hint - before you do this, make sure things are lining up perfectly, I had to slightly open up my frame holes for alignment reasons.
When my time comes, mix my ashes with gunpowder encased in brass, point me towards murderer's and pedophile's and let me fly.
(: ˇ ɹǝʌo ǝɯ 11oɹ ...sıɥʇ pɐǝɹ uɐɔ noʎ ɟı